It’s ok that it ended. I’m glad they didn’t drag it out year after year.
I would guess part of a successful television series is perfectly analogous to an athlete’s or rock star’s career...
Quit too early, and you lose revenue and the ability to really make a bigger impact in your field.
Quit too late, and all people remember about you is the pathetic guy who stayed in the game long enough to make people wish he had left, or the rock star playing in dives to people who have no idea who he is.